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Summary Of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Transition Date) (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained earnings $ 11,353,101,000 $ 9,832,804,000    
Cumulative effect of changes in discount rate assumptions (85,114,000) (113,395,000) $ 76,319,000  
Life and annuity benefits 649,054,000 650,721,000    
Deferred tax liability, net 1,170,399,000 859,559,000    
Effect on accumulated other comprehensive income (loss), net of tax $ (478,210,000) $ (767,494,000)    
Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained earnings       $ 0
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities       119,548,000
Cumulative effect of changes in discount rate assumptions       (138,865,000)
Life and annuity benefits       (19,317,000)
Deferred tax liability, net       4,058,000
Effect on accumulated other comprehensive income (loss), net of tax       $ (15,259,000)